Lightly coat the entire cake with a thin layer of blue frosting. Swirl extra blue frosting on two thirds of the cake to create the ocean with waves and a curvy shoreline. Add whitecaps by squirting white frosting through a pastry bag.

To make the sandy beach, sprinkle graham cracker crumbs on the remaining third of the cake (the crumbs will stick to the thin layer of frosting). Next, let your kids help you turn the cake into a bustling beach. Arrange a circle of candy rocks around a candle bonfire.